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Reference.org
Particular values of the gamma function
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<p>The <a href="/facts/Gamma_function/SjGQcnyw">gamma function</a> is an important <a href="/facts/Special_function/JETSeucA">special function</a> in <a href="/facts/Mathematics/pxTouaz4">mathematics</a>. Its particular values can be expressed in closed form for <a href="/facts/Integer/PUwwrawx">integer</a> and <a href="/facts/Half-integer/oJ29mf8G">half-integer</a> arguments, but no simple expressions are known for the values at <a href="/facts/Rational_number/VJQmyY05">rational</a> points in general. Other fractional arguments can be approximated through efficient infinite products, infinite series, and recurrence relations. </p>